CN202512083U - Auxiliary circuit with electrochemical gas sensor - Google Patents
Auxiliary circuit with electrochemical gas sensor Download PDFInfo
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- CN202512083U CN202512083U CN2012200553063U CN201220055306U CN202512083U CN 202512083 U CN202512083 U CN 202512083U CN 2012200553063 U CN2012200553063 U CN 2012200553063U CN 201220055306 U CN201220055306 U CN 201220055306U CN 202512083 U CN202512083 U CN 202512083U
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Abstract
The utility model relates to an auxiliary circuit with an electrochemical gas sensor, which comprises an electrochemical gas sensor J1, a reverse amplification circuit, a circuit loop and a mos (metal oxide semiconductor) transistor switching circuit, wherein one end of the reverse amplification circuit is connected with a pin 3 of the electrochemical gas sensor J1, and the other end of the reverse amplification circuit is connected with an analog/digital conversion circuit; one end of the circuit loop is connected with a pin 1 of the electrochemical gas sensor J1, and the other end of the circuit loop is connected with a pin 2 of the electrochemical gas sensor J1; and the mos transistor switching circuit is formed by connecting a mos transistor Q1 and a resistor R5 in series, a source electrode of the mos transistor Q1 is connected with the pin 2 of the electrochemical gas sensor J1, a drain electrode of the mos transistor Q1 is connected with the pin 3 of the electrochemical gas sensor, a grid electrode of the mos transistor Q1 is connected with the resistor R5, and the resistor R5 is connected with a power supply. The auxiliary circuit disclosed by the utility model has the advantages of processing miniature signals, ensuring stable signals and reliability and prolonging service life.
Description
Technical field
The utility model relates to a kind of auxiliary circuit of electrochemical gas sensor, relates to a kind of auxiliary circuit that the miniature current signal of electrochemical sensor is handled specifically.
Background technology
Electrochemical gas sensor is formed by membrane electrode and electrolytic solution embedding, and gas concentration signal becomes the negative and positive charged ion with electrolyte decomposition, through electrode signal is spread out of.Its advantage is: response speed is fast, accuracy can reach the ppm level, good stability, can detection by quantitative.
But, electrochemical gas sensor mostly be with the WS as electrolyte, electrolytical evaporation or pollution, regular meeting causes the signal of sensor to descend, serviceable life is short; Because in air, have measured matter to exist, the effective constituent in the sensor is consumed, so sensor just is regarded as having participated in use in case broken seal, even useless in measurement, its life is also shortening; The life-span expectation value of galvanochemistry type gas sensor is 2 years, if the improper use meeting causes the life-span maybe be shorter, and the expense of replacing sensor is higher, thereby makes the manpower and materials that increased cost and maintenance.
The utility model content
The utility model technical matters to be solved is, overcomes the shortcoming of prior art, proposes a kind of miniature signal to be handled, and guarantees signal stabilization, guarantees reliability, the auxiliary circuit of the electrochemical gas sensor that increases the service life.
The technical scheme that the utility model solves above technical matters is:
A kind of auxiliary circuit of electrochemical gas sensor; Comprise electrochemical gas sensor J1, reverse amplification circuit, current return and mos pipe on-off circuit; Said reverse amplification circuit one end is connected with the pin 3 of said electrochemical gas sensor J1, and the other end is connected with analog to digital conversion circuit; Said current return one end is connected with the pin 1 of said electrochemical gas sensor J1, and the other end is connected with the pin 2 of electrochemical gas sensor J1; Said mos pipe on-off circuit is composed in series by mos pipe Q1 and resistance R 5; The source S of said mos pipe Q1 is connected with the pin 2 of electrochemical gas sensor J1; The drain D of mos pipe Q1 is connected with the pin 3 of electrochemical gas sensor J1; The grid of mos pipe Q1 is connected with resistance R 5, and said resistance R 5 is connected with power supply.
The technical scheme that the utility model further limits is:
Said reverse amplification circuit comprises amplifier U2, resistance R 6, resistance R 7 and resistance R 4, and said amplifier U2 and resistance R 6, resistance R 7 are formed reverse proportional amplifier.
Further, said amplifier U2 is that dual power supply amplifies chip, the pin 7 of amplifier U 2 with connect positive supply after filter capacitor C5 is connected, the pin 8 of amplifier U2 connects negative supply.
Further; Said current return comprises amplifier U1 and the resistance R 1 of connecting with the pin 2 of amplifier U1, resistance R 2; Resistance R 3 of connecting and filter capacitor C1, filter capacitor C2 with amplifier pin 3, wherein the pin 6 of amplifier U1 is connected with the pin 1 of electrochemical gas sensor; Filter capacitor C1 one end is connected between resistance R 1 and the resistance R 2, and the other end connects 6 pin of amplifier U1.
Further, said amplifier U1 is that dual power supply amplifies chip, and the pin 7 of said amplifier U1 is connected with positive source and passes through filter capacitor C4 ground connection, and the pin 4 of said amplifier U1 is connected with power cathode and passes through filter capacitor C6 ground connection.
Further, the threshold voltage of said mos pipe Q1 is 3V.
Further, said auxiliary circuit also comprises filter capacitor C8, and the end of filter capacitor C8 is connected other end ground connection with the pin 6 of reverse amplification circuit.
The beneficial effect of the utility model is: the utility model is that current signal provides a loop, is that benchmark amplifies through reverse amplification circuit with the zero point with voltage signal again, has guaranteed that the signal of electrochemical gas sensor is steady and audible; And the utility model uses the mos on-off circuit, when circuit board has electricity, needs the circuit board power supply, sensor outage itself; And, should there be the small battery powered of sensor band itself in circuit board when outage, and the reliability with the assurance sensor increases the service life; In addition, filter capacitor is set, makes the output signal be converted into stable voltage, further guaranteed the stability of signal through after the filtering at output terminal.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
Embodiment one
Present embodiment is a kind of auxiliary circuit of electrochemical gas sensor, and its schematic diagram is as shown in Figure 1, comprises electrochemical gas sensor J1, reverse amplification circuit, current return and mos pipe on-off circuit.
Said reverse amplification circuit one end is connected with the pin 3 of said electrochemical gas sensor J1, and the other end is connected with analog to digital conversion circuit.Said reverse amplification circuit comprises amplifier U2, resistance R 6, resistance R 7 and resistance R 4, and said amplifier U2 and resistance R 6, resistance R 7 are formed reverse proportional amplifier, and said amplifier U2 pin 3 is connected back ground connection with said resistance R 4.Said amplifier U2 is that dual power supply amplifies chip, the pin 7 of amplifier U 2 with connect positive supply after filter capacitor C5 is connected, the pin 8 of amplifier U2 connects negative supply.
Said current return one end is connected with the pin 1 of said electrochemical gas sensor J1, and the other end is connected with the pin 2 of electrochemical gas sensor J1; Said current return comprises amplifier U1 and the resistance R 1 of connecting with the pin 2 of amplifier U1, resistance R 2; The resistance R 3 of connecting with amplifier pin 3; With filter capacitor C1, filter capacitor C2, wherein the pin 6 of amplifier U1 is connected with the pin 1 of electrochemical gas sensor, and said amplifier U1 is that dual power supply amplifies chip; The pin 7 of said amplifier U1 is connected with positive source and through filter capacitor C4 ground connection, and the pin 4 of said amplifier U1 is connected with power cathode and passes through filter capacitor C6 ground connection.
Said mos pipe on-off circuit is composed in series by mos pipe Q1 and resistance R 5; The source S of said mos pipe Q1 is connected with the pin 2 of electrochemical gas sensor J1; The drain D of mos pipe Q1 is connected with the pin 3 of electrochemical gas sensor J1; The grid of mos pipe Q1 is connected with resistance R 5, and said resistance R 5 is connected with power supply.
In addition, said auxiliary circuit also comprises filter capacitor C8, and the end of filter capacitor C8 is connected other end ground connection with the pin 6 of reverse amplification circuit.
The circuit working principle of present embodiment is:
In the circuit of present embodiment, amplifier U1 forms a current return, is output as a negative voltage through voltage ratio, and feedback does not determine output voltage according to current value.It is to be the voltage of benchmark with the zero level that reverse amplification circuit makes amplifying voltage, and according to current trend, the pin 3 of amplifier U2 is set to zero level, and pin 2 is followed pin 3 and also is zero level, and little electric current that sensor points is separated formation becomes negative voltage through behind the R6.So the output pin 6 of amplifier U2 is a positive voltage, form an amplifying circuit through resistance R 7 feedback backs.Enlargement factor is R7/R6, can suitable enlargement factor be set according to the change in current scope.Signal after the amplification behind filter capacitor C8, outputs to the AD treatment circuit, has strengthened the stability of signal.
In the mos pipe on-off circuit, when not having voltage, two sections of metal-oxide-semiconductor Q1 are identical, if voltage is arranged, and voltage is greater than 3V, and metal-oxide-semiconductor Q1 can end, the protection electrochemical gas sensor.Promptly when circuit board had electricity, metal-oxide-semiconductor Q1 ended, the electrochemical gas sensor operate as normal, and when point stops, metal-oxide-semiconductor Q1 conducting, electrochemical gas sensor has the own powered battery of being with itself.
Except that the foregoing description, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (7)
1. the auxiliary circuit of an electrochemical gas sensor; It is characterized in that; Comprise electrochemical gas sensor J1, reverse amplification circuit, current return and mos pipe on-off circuit; Said reverse amplification circuit one end is connected with the pin 3 of said electrochemical gas sensor J1, and the other end is connected with analog to digital conversion circuit; Said current return one end is connected with the pin 1 of said electrochemical gas sensor J1, and the other end is connected with the pin 2 of electrochemical gas sensor J1; Said mos pipe on-off circuit is composed in series by mos pipe Q1 and resistance R 5; The source S of said mos pipe Q1 is connected with the pin 2 of electrochemical gas sensor J1; The drain D of mos pipe Q1 is connected with the pin 3 of electrochemical gas sensor J1; The grid of mos pipe Q1 is connected with resistance R 5, and said resistance R 5 is connected with power supply.
2. the auxiliary circuit of a kind of electrochemical gas sensor according to claim 1; It is characterized in that; Said reverse amplification circuit comprises amplifier U2, resistance R 6, resistance R 7 and resistance R 4, and said amplifier U2 and resistance R 6, resistance R 7 are formed reverse proportional amplifier.
3. the auxiliary circuit of a kind of electrochemical gas sensor according to claim 2 is characterized in that, said amplifier U2 is that dual power supply amplifies chip, the pin 7 of amplifier U2 with connect positive supply after filter capacitor C5 is connected, the pin 8 of amplifier U2 connects negative supply.
4. the auxiliary circuit of a kind of electrochemical gas sensor according to claim 1; It is characterized in that said current return comprises amplifier U1 and the resistance R 1 of connecting with the pin 2 of amplifier U1, resistance R 2, the resistance R 3 of connecting with amplifier pin 3; With filter capacitor C1, filter capacitor C2; Wherein the pin 6 of amplifier U1 is connected with the pin 1 of electrochemical gas sensor, and filter capacitor C1 one end is connected between resistance R 1 and the resistance R 2, and the other end connects 6 pin of amplifier U1.
5. the auxiliary circuit of a kind of electrochemical gas sensor according to claim 4; It is characterized in that; Said amplifier U1 is that dual power supply amplifies chip; The pin 7 of said amplifier U1 is connected with positive source and through filter capacitor C4 ground connection, and the pin 4 of said amplifier U1 is connected with power cathode and passes through filter capacitor C6 ground connection.
6. the auxiliary circuit of a kind of electrochemical gas sensor according to claim 1 is characterized in that, the threshold voltage of said mos pipe Q1 is 3V.
7. according to the auxiliary circuit of the described a kind of electrochemical gas sensor of the arbitrary claim of claim 1-6, it is characterized in that said auxiliary circuit also comprises filter capacitor C8, the end of filter capacitor C8 is connected other end ground connection with the pin 6 of reverse amplification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200553063U CN202512083U (en) | 2012-02-21 | 2012-02-21 | Auxiliary circuit with electrochemical gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200553063U CN202512083U (en) | 2012-02-21 | 2012-02-21 | Auxiliary circuit with electrochemical gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202512083U true CN202512083U (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200553063U Expired - Fee Related CN202512083U (en) | 2012-02-21 | 2012-02-21 | Auxiliary circuit with electrochemical gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202512083U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977318A (en) * | 2015-03-02 | 2015-10-14 | 深圳市卡卓无线信息技术有限公司 | Gas concentration detection method of carbon monoxide, formaldehyde and alcohol, and mobile terminal |
| CN105136878A (en) * | 2015-08-14 | 2015-12-09 | 成都易思科科技有限公司 | CO detection signal amplifying circuit |
-
2012
- 2012-02-21 CN CN2012200553063U patent/CN202512083U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977318A (en) * | 2015-03-02 | 2015-10-14 | 深圳市卡卓无线信息技术有限公司 | Gas concentration detection method of carbon monoxide, formaldehyde and alcohol, and mobile terminal |
| CN105136878A (en) * | 2015-08-14 | 2015-12-09 | 成都易思科科技有限公司 | CO detection signal amplifying circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 Termination date: 20150221 |
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| EXPY | Termination of patent right or utility model |